Abstract: To improve the accuracy of finite element modeling for power battery systems, this paper constructs a refined simulation model, where the interior of the cells adopts a homogenized solid modeling approach, and the liquid cooling system tries multiple modeling schemes. By conducting modal simulations and experimental sweep frequency tests on the battery pack modules and the overall system, and comparing and analyzing multiple sets of data, it is found that when the cell elastic modulus is set to 100 MPa, the simulation mode has the highest degree of agreement with the experimental results; when the liquid cooling system adopts a mutually bound connection and a freeze connection with the modules, the consistency between the system-level simulation mode and the experimental mode is optimal, while the number of mesh layers of the thermal conductive adhesive has no significant impact on the simulation results. The research shows that this modeling method and conclusions can accurately predict the structural response of the power battery pack, providing a reliable reference for the refined modeling of power battery finite element simulations.

Key words: power battery pack; finite element; constrained mode; test mode

摘要： 为提升动力电池系统有限元建模的准确性，文章构建了精细化仿真模型，该模型内部 采用均质化实体建模，液冷系统则尝试多种建模方案。通过对电池包模组及整体系统开展模 态仿真与试验扫频测试，对比分析多组数据后发现，当电芯弹性模量设为 100 MPa 时，仿真 模态与试验结果的吻合度最高；液冷系统采用相互绑定连接且与模组进行 freeze 连接的方案 时，系统级仿真模态与试验模态的一致性最优，而导热胶的网格层数对仿真结果无显著影响。 研究表明，该建模方法及结论可精准预测动力电池包的结构响应，为动力电池有限元仿真的 精细化建模提供了可靠参考。

关键词: 动力电池包；有限元；约束模态；试验模态